Thanks for this. I bang the whole lot on when i get in, didn't know that i wasn't supposed to! I will try it without the blowers and see if it still happens. I don't fancy getting a new alternator/air con pump though, i was hoping that it would be an easy, cheap and well known fix.
I've got a 06 plate Focus Zetec Climate which has developed a problem with the heated front windscreen. When I switch it on to clear the screen before I drive I hear a knocking noise coming from the drivers side of the engine compartment. This does not seem to happen when the engine is warmer however I don't often have the need to use it then! Does anyone know how I can fix this as it is particulary irritating. Thanks in advance